When replacing a screw in case back I'm confused as to if the case back threads and the gasket or rubber O ring should have a light coating of oil such as stem lube.
My watch maker does very good work but never lubes the threads.
It just seems to me that to lightly lube the threads will allow the back to screw in much easier. And a light coating on the rubber O ring would create a better seal.
So, what do you think?